you can choose in installation from imscp if you want to control helo and other things, which will reject the mails ( spam mostly)
it would be cool if it would be an option to switch it on or off
i found nothing where i can do this
is it possible to chioce this per domain?
domaina wants all mails
domain2 wants less spam and switched it off
i found nothing, but maybe i´m blind
Per domain is not implemented but is planned.